buy a proper power supply.
dont bother with a computer one, especially if you have to pay for it.
here are a few issue with it...
1. they will flick off if you add chargers to it when the PS is on.
2. they will flick off if you use it to power a dyno, especially mod motors. 9works ok for stock motors)
3. the fan is always on, gets annoying
4. depending on your club, they may not be legal (insurance issues)
5. it looks ugly
6. if you dont know what you are doing you could kill yourself
7. there PS is open, and foreign objects could fall in.
8. they do not work with every charger.
9. you look like a tight arse.